CuO formation control as a function of mixed ratio of Cu-free powders in the synthesis of YBCO superconductors on Cu substrates |
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| Authors: | Youngha Kim Sungkwan Kim Young-Ah Jeon Yunseok Kim Hanjong Paik Yangsoo Kim Sang-Chul Han Young-Hee Han Nyeon-Ho Jeong Tae-Hyun Sung Jong-In Hong Kwangsoo No |
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| Affiliation: | (1) Electronic and Optical Materials Laboratory, Dept. of Mat. Sci. & Eng., Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea;(2) Superconductivity & Applications Group, Korea Electric Power Research Institute, 103-16 Munji-dong, Yuseong-gu, Daejeon, 305-380, Korea;(3) Microsystem Research Center, Korea Institute of Science and Technology, P.O.BOX 131, Cheongryang, Seoul, 130-650, Korea |
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| Abstract: | YBa2Cu3Ox (Y123) superconducting films were fabricated on Cu substrates using a simple screen-printing method, from Cu-free powders
(Y2O3 and BaCO3). In the process, CuO, which causes superconducting properties of Y123 films to deteriorate, was formed on the film surface.
By varying the atomic ratio of Y to Ba (Y:Ba = 1:1∼1:4), the ratio needed to prevent CuO formation was found for the film
surface that had been heat-treated at 980∘C for 17 s. The film, with the ratio of Y to Ba (Y:Ba = 1:1), is reheat-treated at 930∘C for 9 min 30 s to form a superconducting Y123 phase. It was possible to prevent CuO formation by controlling the ratio of
Cu-free powders in the mixture and to fabricate YBCO superconductors on Cu substrates using a two-step heat-treatment. |
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| Keywords: | YBCO CuO Cu substrates Two-step heat-treatment Screen-printing |
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